For the First Twenty-Five Years After the Crimean War,European Affairs

For the first twenty-five years after the Crimean War,European affairs were ________.

A) relatively stable,as countries respected the Vienna settlement
B) tumultuous,as countries adapted to shifts in power
C) unstable,as fears of revolutions declined and the great powers had less reverence for the Vienna settlement
D) stable,as countries joined forces to prevent another war